The NCL30083 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. The device supports 5 step log dimming down to 5%. To enhance system lifetime, it has current foldback at a user programmable temperature point. While the NCL30083 has integrated fixed overvoltage protection, the designer has the option to program a lower overvoltage protection level.
Features | | Benefits
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Primary Side Sensing
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No optocoupler or secondary control circuitry required
Wide VCC Range
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Allows support for wide number of LEDs in string and simplifies transformer design
Precise LED Current Regulation of ±1% typical
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No need for binning of LED forward voltage or trimming in production for accuracy
~ 0.9 power factor with passive valley fill
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Meets Energystar® LED Bulb and Residential Luminaire Standards
User Programmable Thermal Foldback
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Protects system from overheating by gracefully reducing current
Open and Shorted Output Protection
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Robust handling of faults
Secondary Diode Short Protection
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Avoids overheating in fault conditions
5 Step Dimmable to < 5% output current
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Allows dimming with standard wall switch
VCC undervoltage and overvoltage protection
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Reliable operation across all conditions
Latched (A version) and Auto-recoverable (B version) fault handling
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Flexiblity in design
Wide temperature range of -40 to 125 °C
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Supports outdoor and high temperature operating environments
